I hear 'Never said she was' - and who would know better the involvement of others than one of the ringleaders of the plot.
But I don't think WA is blameless or guiltless, she had to be the one to give the info of where DM was and when on the day of the killing (at a minimum).
From the things she says to her mother in the text it seems she makes it clear she is looking out for herself and no one else, she's gotten everything she wanted, Danny out of the way, living where she wants to with her boys, contact with her family as she wants it and not how they want it, and so far, a role only as a witness and not a defendant.
Things worked out pretty well for her and it seems she means to keep it that way, even if the whole rest of her family (minus her brother up north) is in prison.